Legal basis: Criminal Procedure Law of People's Republic of China (PRC).
Article 37 The duty of a defender is to present materials and opinions on whether a criminal suspect or defendant is innocent, light or relieved of criminal responsibility according to facts and laws, and to safeguard the litigation rights and other legitimate rights and interests of the criminal suspect or defendant.
Article 38 In the process of investigation, defense lawyers can provide legal aid to criminal suspects, apply for changes in compulsory measures on their behalf in complaints and accusations, learn from the investigation organs about the charges charged by criminal suspects and the relevant circumstances of the case, and express their opinions.
Article 88 When examining and approving an arrest, a people's procuratorate may interrogate a criminal suspect. In any of the following circumstances, the criminal suspect shall be questioned: (1) having doubts about whether the conditions for arrest are met; (2) The criminal suspect requests to make a statement to the procurator in person; (three) there may be major violations in the investigation. When examining and approving an arrest, the people's procuratorate may question witnesses and other participants in the proceedings and listen to the opinions of defense lawyers. If a defense lawyer makes a request, he shall listen to the opinions of the defense lawyer. Acts that should be punished by penalty should be put on file only when such criminal facts really need to investigate the criminal responsibility of the perpetrator.